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词汇 Dropstones
分类 英语词汇 英语翻译词典
释义

Dropstones

英语百科

Dropstone

(重定向自Dropstones)
A dropstone of quartzite in layered rhythmite at Itu, Brazil
Glacial dropstone from Permian rocks in eastern Australia
Examples of gastrolith dropstones from the Tropic Shale (Cretaceous) of Utah

Dropstones are isolated fragments of rock found within finer-grained water-deposited sedimentary rocks. They range in size from small pebbles to boulders. The critical distinguishing feature is that there is evidence that they were not transported by normal water currents, but rather dropped in vertically through the water column.

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